Process of producing papers having alpha glossy surface



tPatentecl' Mar. 5, 1929.

UNITED STATES PATENT OFFICE.

ALBRECHT SCHMIDT, OF FRANKFORT-ON-THE-MAIN, GERHARD BRLLE, OF HOOHST- ON-THE-M AIN, AND KUNO FRANZ, OF FRANKFORT-ON-THE-MAIN, GERMANY, AS-

SIGNORS TO I. G. FARBENINDUSTRIE AKTIENGESELLSOHAFT, OF FRANKIORT-ONr.

THE*MAIN, GERMANY, A CORPORATION OF GERMANY. y

PROCESS PRODUCING PAPERS HAVING GLOSSY SURFACE.

No Drawing. Application filed January 6, 1928, Serial No. 245,048, and in Germany January 13, 1927.

The present invention relates to the manufacture of paper with a glossy surface.

We have found, that papers with a glossy surface-can be made by uniting paper with sheets of regenerated cellulose, for instance of the cellulose material known under the trade-name cellophane.

The process of uniting the said two materials can be carried out in different manners,

for instance by unrolling simultaneously a roll of a cellophane-film and a roll of paper and pressing both materials upon each other by meansof cylinders, either in a moist or dry state or, for instance, while the film is in a moist condition and the paper in a dry condition or reversely. This may be operated in the cold or in the heat or first in the cold and then in the heat. The material may be moistened either by spraying between the paper-band and cellulose band, preferably shortly before the materials are united, a liquid for instance water, or by passing the cellulose band and the paper band over cylinders which are'continuously kept moist, or

2 5 finally'by passingvthe two bands through water baths, the excess of moisture being, if required, removed from the material-by means of squeezing-rollers. As, thus, a perfect cohesion of the two materials is attained the use of an agglutinant may be despensed with when the finished paper is to be used for certain purposes. For other purposes, an

agglutinant may be employed such as for in-' stance, starch, glue, solutions of cellulose de- .rivatives or the like. The two materials may also be united with each other by using instead of the finished cellulose pellicles which are in a swollen and still moist state. Moreover, the cellulose xanthogenate solution may i 40 be applied as such directly to the paper-band and precipitated thereon.

Into the cellulose xanthogenate solution as well as into the finished cellulose pellicle there may beincorporated in a suitable manner any substances intended to produce a particular hardness or softness or'any other property of the cellulose layer.

The pa er thus obtained canbe used for a variety 0 purposes, all the more. so as their is mounted on a shaft. From this roll the cellulose band runs, at the same speed at which the paper-web moves on, over a guideand calender roller on to the paper-band which is still wet and the two hands, after being thus united, pass through the parts of the machine containing the dandyand calender roll. If required, there may be sprayed between the celluloseand paper bands, preferably shortly before they are united, a solution of one of the known adhesive substances.

The celluloseand paper bands may be united in the above described manner in any other part of the paper-machine, also on cylinder-paper machines or on card boardmachines. i

We claim:

1. The process of-producing papers having a glossy surface, which consists-in uniting paper with a film of regenerated cellulose.

2. The process of producing papers having a glossy surface, which consists in uniting paper with a film'of regenerated cellulose in moist state.

3. The process of producing papers having a glossy surface, which consistsin uniting paper with a film of regenerated cellulose by means of an agglutinant.

4. The process of producing papers having a glossy surface, which consists in uniting 5. The process of producingpapershaving a glossy surface, which consists in uniting on a paper machine the paper-web with an undried regenerated cellulose film.

6. The process of roducing papers having a glossy surface, w ich consists in uniting the two materials upon each other and passing the thus pressed and through the machine. In testimony wherecf, we afiix our signatures.

ALBRECHT SCHMIDT. GERHARD BALLE. KUNO FRANZ.

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